GPS is a godsend when it works. Problem is, there are plenty of places it doesn’t work—tall skyscrapers, concrete overpasses, and other huge structures all block the satellite signal. Luckily, Swiss company u-blox devised a chip that keeps you on course when the satellites drop out, using the most old-fashioned of navigation techniques: dead reckoning. [...]
GPS is a godsend when it works. Problem is, there are plenty of places it doesn’t work—tall skyscrapers, concrete overpasses, and other huge structures all block the satellite signal. Luckily, Swiss company u-blox devised a chip that keeps you on course when the satellites drop out, using the most old-fashioned of navigation techniques: dead reckoning. [...]
